Telephone branch line transmission circuit with blocking capacit

Details Telephone branch line transmission circuit with blocking capacit Telephone branch line transmission circuit with blocking capacit

1992-12-14

1994-04-26

Sikes, William L.

Telephonic communications

Centralized switching system

Switching controlled in response to called station...

379379, 307246, 307254, 307570, H04M 322

Patent

active

053074033

ABSTRACT:
A telephone branch line transmission circuit includes a control device which receives dial pulses and in response thereto controls at least two switching devices arranged between two branch lines to a telephone exchange. A blocking capacitor is coupled to the first switching device. In order to prevent charging of such capacitor from distorting the current supplied from the exchange at the end of a dial pulse, the first switching device is included between the blocking capacitor and one of the branch lines. The connection node thereof with the blocking capacitor is connected to a terminal of a second switching device, another terminal of which is coupled to the second branch line. The control terminal of the second switching device is connected to a storage capacitor. In the off-state of the switching devices no residual direct current can flow from the exchange to charge the blocking capacitor. Consequently, upon termination of a dial pulse, the blocking capacitor cannot distort the current supplied by the exchange. The storage capacitor charges during dial pulses and establishes a high impedance across the branch lines after dialing is completed.

REFERENCES:
patent: 3333113 (1967-07-01), Cole et al.
patent: 3458799 (1969-07-01), Collings
patent: 3555298 (1971-01-01), Neelands
patent: 3660683 (1972-05-01), Wangard
patent: 3838923 (1974-09-01), Shah
patent: 4251743 (1981-02-01), Hareyama

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